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Investigation of surface texture influence on hydrodynamic performance of parallel slider bearing under transient condition

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Abstract

Although surface texture has been becoming an attractive technique for improving hydrodynamic performance in lubrication system, the study of surface texture mainly focus on the steady-state load conditions. This investigation evaluates the effect of surface texture on hydrodynamic performance under transient lubrication in parallel bearing. In the case, considering cavitation phenomena in liquid lubricating film, a mass conserving formulation based on Elrod–Adams model with JFO conditions is then employed. The implementation of numerical simulation is discretized in spatial and time domain for calculating the pressure distribution. The effect of different geometrical configurations of lubricated contact on hydrodynamic performance is evaluated. The results show that surface texture in parallel bearing yields a great improvement in terms of friction force and friction coefficient.

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Abbreviations

\(L\) :

Bearing length (mm)

\(B\) :

Bearing breadth (mm)

\(tl\) :

Texture width (mm)

\(ti\) :

Texture interval (mm)

\(d\) :

Texture depth (μm)

\(h(t)\) :

Oil film thickness between two surfaces (μm)

\(h_{0}\) :

Reference film thickness (μm)

\(h_{1}\) :

Oscillations amplitude (μm)

\(f\) :

Oscillations frequency (Hz)

\(t\) :

Time (s)

\(\eta\) :

Dynamic viscosity of lubricant (Pa s)

\(U\) :

Relative sliding velocity (m/s)

\(\rho\) :

Lubricant density (kg/m3)

\(\theta\) :

Cavity fraction

\(p\) :

Flow pressure (Pa)

\(p_{a}\) :

Ambient pressure (Pa)

\(p_{cav}\) :

Cavitation pressure (Pa)

\(\rho_{avg}\) :

Mean density of lubricant (kg/m3)

\(h\) :

Lubricant thickness of textured surface (μm)

\(\Omega\) :

Calculated domain

\(N_{1}\) :

Nodes in the x-direction

\(N_{2}\) :

Nodes in the y-direction

\(\Delta x\) :

Interval between two neighbor nodes in the x-direction

\(\Delta y\) :

Interval between two neighbor nodes in the y-direction

\(\Delta t\) :

Length of time step

\(K\) :

Discretization number of time

\(\omega\) :

Relaxation factor

\(W\) :

Load-carrying capacity (N)

\(F\) :

Friction force (N)

\(FC\) :

Friction coefficient

\(W_{avg}\) :

Time-averaged load-carrying capacity (N)

\(F_{avg}\) :

Time-averaged friction force (N)

\(FC_{avg}\) :

Time-averaged friction coefficient

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Acknowledgements

This work is supported by the Research Foundation for Advanced Talents of Jiangsu University (Grant Numbers 1291110065).

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  1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, China

    Yanxiang Han & Yonghong Fu

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  1. Yanxiang Han
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Correspondence to Yanxiang Han.

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Han, Y., Fu, Y. Investigation of surface texture influence on hydrodynamic performance of parallel slider bearing under transient condition. Meccanica 53, 2053–2066 (2018). https://doi.org/10.1007/s11012-017-0809-8

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